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Plant more forest species for more biodiversity

on 13th October 2013

The completed research by Prof. Hugh Tan’s doctoral student at the Department of Biological Sciences, National University of Singapore, as posted HERE and HERE highlights the different biodiversity seen in managed and spontaneous vegetation.

The study by Dr Chong Kwek Yan showed that the biodiversity in managed vegetation tends to be homogeneous while that in spontaneous vegetation is more diverse – as far as birds and butterflies are concerned.

This is understandable. Managed vegetation makes use of a limited number of tree and shrub species. On the other hand, with spontaneous growth like scrubland and young secondary forest, the diversity of plants is very much more. And as the vegetation ages from scrub to forest, the biodiversity improves, reaching the optimum when the secondary forest eventually matures into a primary forest (above: patch of primary forest in the MacRitchie catchment by Wang Luan Keng).

This increasing biodiversity as the vegetation matures is due to the increasing complexities from scrub to secondary then primary forest. And with increasing diversity of plant species, the faunal diversity (especially the invertebrates) increases. This is because each plant species has its own complement of invertebrate fauna, especially insects that feed and breed on it.

And as trees mature, epiphytes and semi-parasites find their way onto their branches that again increase invertebrate diversity. The presence of invertebrates will in turn attract a diversity of vertebrates – higher faunal forms like amphibians, reptiles, birds and small mammals.

The problem of low biodiversity in managed vegetation can easily be rectified by planting more plant species along roadsides (above: roadside trees along Sian Tuan Avenue by YC Wee) and in parks. Introducing food plants of butterflies between roadside trees and in parks will easily increase butterfly diversity. I am sure this is ongoing, undertaken by the National Parks Board. Better still, incorporate wild growth into more parks, an excellent example being the Bukit Batok Nature Park.

A tree like the common mahang (Macaranga bancana) attracts hordes of birds that visit for the nectar and fruits. It is common in our Central Catchment Reserve but local birdwatchers were unaware of it’s potential until a birder from Ipoh in Malaysia made a series of postings in this site 1. 2, 3, 4, 5, 6, 7, 8 and 9.

In total, Dato’ Dr Amar-Singh HSS documented 23 species of birds attracted to this tree, as listed below:

Brown Barbet; Black-headed, Buff-vented, Cream-vented, Hairy-backed, Red-eyed and Spectacled Bulbuls; Asian Brown, Blue-and-white, Rufous-chested and Yellow-rumped Flycatchers; Blue-crowned Hanging-parrot; Green Iora: Long-tailed Parakeet; Grey-breasted, Little, Spectacled and Yellow-eared Spiderhunters; Plain, Purple-naped, Red-throated and Ruby-cheeked Sunbirds; and Everett’s White-eyes.

Yet, when it was suggested that this tree be introduced to our urban environment, local birdwatchers, even seasoned ones, were not supportive – see HERE and HERE.

I wonder why?

YC Wee
Singapore
October 2013

If you like this post please tap on the Like button at the left bottom of page. Any views and opinions expressed in this article are solely those of the authors/contributors, and are not endorsed by the Lee Kong Chian Natural History Museum (LKCNHM, NUS) or its affiliated institutions. Readers are encouraged to use their discretion before making any decisions or judgements based on the information presented.

YC Wee

Dr Wee played a significant role as a green advocate in Singapore through his extensive involvement in various organizations and committees: as Secretary and Chairman for the Malayan Nature Society (Singapore Branch), and with the Nature Society (Singapore) as founding President (1978-1995). He has also served in the Nature Reserve Board (1987-1989), Nature Reserves Committee (1990-1996), National Council on the Environment/Singapore Environment Council (1992-1996), Work-Group on Nature Conservation (1992) and Inter-Varsity Council on the Environment (1995-1997). He is Patron of the Singapore Gardening Society and was appointed Honorary Museum Associate of the Lee Kong Chian Natural History Museum (LKCNHM) in 2012. In 2005, Dr Wee started the Bird Ecology Study Group. With more than 6,000 entries, the website has become a valuable resource consulted by students, birdwatchers and researchers locally and internationally. The views and opinions expressed in this article are his own, and do not represent those of LKCNHM, the National University of Singapore or its affiliated institutions.

Other posts by YC Wee

One Response

  1. I wish to add that an increase in plant biomass is helpful in modifying climate change. The urban plant biomass cannot be compared to that of a primary jungle.
    The plant biomass of a prime forest has the ability to absorb tons of carbon dioxide & move tons of water back into the atmosphere. It’s beneficial effect is extensive! Concrete jungles dotted with pretty green areas cannot do that. It becomes imperative that we should stop building more & more concrete edifices, which would only help to generate more heat (exoergic heating effect). Instead, plant more forests, as it has the beneficial endoergic cooling effect on the island of Singapore!

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